Limited by the lower adoption rate Ruby has had, not that many people got to know Radiant CMS across the years.

This small CMS is one of the most versatile and customizable CMSs created across time, a solid base on which various types of websites, with various types of layouts and content can be built.

Heavily accentuating content and code reuse, Radiant CMS not only provides the tools for developers and editors to do so, but they're also deep engrained in the admin interface as well.

You won't see many CMSs like Radiant where code snippets, assets, and layouts occupy such a central, visible role in the backend, letting new-comers know from the start they're dealing with a professional tool.